The men, pictured on the roof of the building, work for a firm within the office block which came under siege by student protesters.

They do not work for the Tory Party and have contacted police to make themselves known. It is understood they are angry that they were being associated with the violent demonstrators and say they were protecting the building. Scotland Yard detectives spent hundreds of hours analysing the footage before they released images “in connection with the disorder” of 13 unidentified people with whom they wished to speak.

Last night a spokesman confirmed that two of the people had been traced. Detectives will now talk to the men.

Meanwhile, a detective leading the hunt for those who committed criminal acts said that most of the 59 arrested so far were “thoughtful, articulate people” who have little or no history of trouble.

Acting Detective Inspector Will Hodgson, the head of Operation Malone, said: “Unfortunately, we are finding that many of these people are young students who do not seem to have been in any trouble before.

“From a parent’s point of view, it must be very concerning. These are young people committing really serious offences which I suspect may result in prison sentences for some.”